Control The Ph - GE Xcellerex XDM Series Operating Instructions Manual

7.3.4

Control the pH

pH PID control loop
The pH PID control loop is a split range loop: the output of the pH control loop controls
both the acid and base pump PID control loops. The acid and base PID control loops are
nested loops inside the pH control loop. The error of the outer loop (pH control loop)
controls the CVs of the inner loops (acid and base control loops).
The pH control can be set to work in Auto or in Manual mode. In Auto mode, the PLC
controls the pH of the disposable bag contents to the setpoint (SP). In Manual mode, the
PLC keeps the pump speed at the manually defined CV value (% of total pump speed
range). See Work in Manual mode, on page 217 for more information.
Work in Auto mode
To set the pH control to work in Auto mode follow the instructions below.
Step
1
Xcellerex XDM 50-1000, XDUO 100-1000 mixers Operating Instructions 29251615 AD
Action
On the home screen, tap pH top open the pH Detail screen.
7 Operation
7.3 Operate Xcellerex XDUO mixer
7.3.4 Control the pH
215